linux-kernel - RE: [PATCH net] netfilter: nf_queue:fix reinject verdict handling

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Message-ID: <CWXP265MB1464BCF96C61A8FD47619AE59E0F0@CWXP265MB1464.GBRP265.PROD.OUTLOOK.COM>
Date:   Mon, 13 May 2019 10:36:51 +0000
From:   Jagdish Motwani <Jagdish.Motwani@...hos.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jagdish Motwani <j.k.motwani@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        "netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
        "coreteam@...filter.org" <coreteam@...filter.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH net] netfilter: nf_queue:fix reinject verdict handling

Hi Pablo,

The case I am referring to is : If there are more than 1  hooks returning NF_QUEUE verdict.
When the first queue reinjects the packet, 'nf_reinject' starts traversing hooks with hook_index (i).
However if it again receives a NF_QUEUE verdict (by some other netfilter hook), it queue with the wrong hook_index.
So, when the second queue reinjects the packet, it re-executes some hooks in between the first 2 hooks.

Thanks, I will mark :  Fixes: 960632ece694 ("netfilter: convert hook list to an array") and update the description also.

Regards,
Jagdish
-----Original Message-----
From: Pablo Neira Ayuso <pablo@...filter.org>
Sent: Monday, May 13, 2019 2:52 PM
To: Jagdish Motwani <j.k.motwani@...il.com>
Cc: netdev@...r.kernel.org; Jagdish Motwani <Jagdish.Motwani@...hos.com>; Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>; Florian Westphal <fw@...len.de>; David S. Miller <davem@...emloft.net>; netfilter-devel@...r.kernel.org; coreteam@...filter.org; linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] netfilter: nf_queue:fix reinject verdict handling

Hi Jagdish,

On Thu, May 09, 2019 at 12:01:14AM +0530, Jagdish Motwani wrote:
> From: Jagdish Motwani <jagdish.motwani@...hos.com>
>
> In case of more than 1 nf_queues, hooks between them are being
> executed more than once.

This refers to NF_REPEAT, correct?

I think this broke with 960632ece6949. If so, it would be good to add the following tag to this patch then. It's useful for robots collecting fixes for -stable kernels.

Fixes: 960632ece694 ("netfilter: convert hook list to an array")

> Signed-off-by: Jagdish Motwani <jagdish.motwani@...hos.com>

Thanks.

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